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I would suggest your crossover unit has failed in the speaker cabinet. The crossover circuit board separates the low and high frequency content of your stereos audio signal. The low frequencies go to the bass unit (woofer) and the high frequencies go to the tweeter speaker. If the capacitor on the crossover goes open or near open circuit then noise is introduced into the sound system. Replace either the capacitor or crossover unit.

It could be a safety protection meaning you could have a shorted speaker check all speakers and wiring, or it could be a defective volume control, try cleaning the volume with a contact cleaner spray you can find at any good electronic store (you normally have to open the radio to reach the POTENTIOMETER/VOLUME) to be able to spray inside it, than alternate (high/low) the control repetively to move/clean the volume's circuitry

Check the dealer and see if your radio automatically adjust to your speed. Some radios were built to raise the volume when driving at higher speeds and when you get in slow traffic or when you stop it would automatically adjust down the volume. You can also go to a Radio Shack and get a spray cleaner for electrical parts and pull the volume knob off of your radio and spray the volume control and turn it rapidly to remove any hidden dirt on that volume control.

As a test, locate the remote control window on the front of the unit, if it has one. Set it up to watch or listen to something then cover the remote window on the unit with a small piecr of cardboard. If you can't locate its infrared receiver for the remote just cover the entire front of the unit with something sufficiently opaque to block your remote. Try to operate it with th remote to be sure the unit can't see it.

If the expected problem never comes back you have a stray signal from something else in the environment getting interpreted as a 'volume up' command. Then look around for other remotes being used, wireless devices, use your imagination. I used to have a remote-controlled space heater and my TV would sometimes shut off if I used the remote. Does the unit have line-of-sight to a nearby house? Maybe something next door (garage opener?) is interfering.

If it still happens and there are no other infra-red devices nearby you have a ghost.

Hi,
This sounds like a case of a dirty/defective rotary encoder. The volume control used here is not the conventional potentiometer type , but a rotary set of switches that tell the sytem if the knob is being turned left ot right.
Do you think you'd be able to open the unit and spray some contact cleaner into the rotary encoder? It might involve dis-assembling it down to front bezel removal.
jango.

If the sub has a volume control, turn it down then turn up the volume on the amp to the very high volume you mentioned. If it still has very low muffled sound, then we know the problem is about the amp.